Metal lath.



UNITED STATESV Patented February 14, 1905.

PAUL KHNE, OE BROOKLYN, NEW YORK.

NIETAL LATH.

SPECIFICATION forming part of Letters Patent'No. 782,667', dated February v14, 1905,

Application filed December 6, 1904. Serial No. 235,772.

'L'o (L7/Z whom, it 'may concern: l Be it known that I, PAUL KHNE, a citizen of the United States, residing in the borough of Brooklyn, in the State of New York, havei-n vented certain new and useful Improvements in Metal Laths, ofwhich the following is a specification.

rIhe object of thisinvention is to provide a strong metal lath having a capacity for making an effective bondfor the plaster, said lathV to be made with economy of material, so that the lath produced from a sheet of given width is of approximately the same width as such original sheet. For this purpose the invention comprises a corrugated slitted sheet of metal lathing in which the corrugations are allowed for by a lateral expansion of the metal of the corrugations.

The invention consists, further, of a corrugated slitted sheet of metal lathing in which the sheet shown in Fig. 1,sraid section illustrating in detail the construction of thelath.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, the improved lath, which is made of annealed sheet-steel or other metal, comprises corrugations a and web portions between said corrugations a, said corrugations and web portions in the forni of a lath being shown alternately in successionV transversely ofthe sheet. c and d indicate slits made in the sheet. The metal of the sheet is for the purpose of forming said slits or openings bent in outward direction from the web portions of the sheet, as indicated by the dotted lines in Fig. 3, thereby forming between the corrugations depending 'iianges e, which afford asecure hold for the plaster. In order that said flanges and the web portions between the ends of the ianges may be of practically their original full strength, as supplied bythe material of the sheet, said flanges are not drawn indirection laterally of the sheet; but the same are. permitted to remain in substan- .tially their original condition and of the Original thickness and the expansion necessary to preserve the sheet at its full width, whereby economy of material is effected, is made in the corrugations a, in which the metal becomes thinner. There is thereby provided a plurality of parallel uniform expanded ridges lengthwise ofthe sheet alternating with a plurality of non-expanded slitted portions.

In order to provide maximum strength at or near the bent edge between the web portions and the corrugations, the metal is allowed to remain of its full thickness at said edge and is tapered in thickness therefromthat is to say, Vformed of Ygradually-reduced thickness toward the apex of the corrugations-as clearly shown in Fig. 3, the point of greatest thinness being at or near said apex. The distribution of metal in thismanner produces a lath of substantiallyuniform strength throughout its surface, while at the same time providing flanges and bases'for the flanges of the full thickness of the original sheet.

In order to obviate any tendency to buckle, the slits or openings through the web portions b are preferably made of diiierent lengths, as indicated in the drawings, in which c indicates openings of short length, which are arranged to alternate with openings d of greater length, said openings Z also alternating transversely of the sheet with the shorter openings c. The flanges of varying length provide a superior Vbond for the plaster and facilitate the securing ofthe same at points diiicult of access and where no adjacent support is available.

.The further securing rigidity of the sheet in IOO Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A corrugated slitted sheet of metal lathing in which the corrugations are allowed for by the lateral expansion of the metal in the corrugations themselves.

2. A corrugated slitted sheet of metal lathing having apertures therein, the metal at the edges of which is turned outwardly as a flange and the eorrugations allowed for by the lateral expansion of the metal in said corrugations.

3. A corrugated slitted sheet of metal lathing comprising web portions provided with longitudinal openings surrounded by iianges turned up out of the metal of the web portions, and intermediate corrugations, the expansion of the sheet being allowed for by the expansion of the metal in said corrugations, and said web portions being. ot' substantially the original thickness of the sheet.

4. A corrugated slitted sheet oi' metal lathing comprising web portions provided with longitudinal openings surrounded by flanges turned up out of the metal of the web portions, and intermediate corrugations, the expansion of the sheet being allowed for by the expansion of the metal in said corrugations, said oorrugations being of gradually-decreasing thickness toward the apex of the same, and said web portions being of substantially the original thickness of the sheet.

5. A corrugated slitted sheet of metal lathing comprising web portions provided with longitudinal openings surrounded by flanges turned up out of the metal of the web portions, intermediate corrugationaand bridge portions extending laterally of the sheet in said corrugations, between the slots of the Web portions, the expansion of the sheet being allowed for by the expansion of the metal in said corrugations, said corrugations being of gradually-decreasing thickness toward the apex of the sheet and said web portions being of substantially the original thickness of the sheet.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

l PAUL KUHNE. lfVitnesses:

JOSEPH H. NILEs, HENRY J. SUHRBIER. 

